TY - JOUR AU - Penn, David AU - Apell, S C2 - Physical Review B (Condensed Matter and Materials Physics) DA - 1990-01-01 LA - en M1 - 41 PB - Physical Review B (Condensed Matter and Materials Physics) PY - 1990 TI - Theory of Spin Polarized Metastable Atom De-excitation Spectroscopy; Ni-He ER -